package Collection;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;

public class CollectionDemo {
    public static void main(String[] args) {
        Collection c=new ArrayList();
        c.add(new Point(1,2));
        c.add(new Point(3,4));
        c.add(new Point(5,6));
        c.add(new Point(7,8));
        c.add(new Point(9,0));
        c.add(new Point(1,2));
        System.out.println(c);

        Point p=new Point(1,2);
        boolean contains=c.contains(p);
        System.out.println("是否包含："+contains);
        c.remove(p);
        System.out.println(c);
        c.remove(p);
        System.out.println(c);//[(100,2000)]

        Point pp=new Point(10,200);

        Collection cc=new ArrayList();
        cc.add(pp);
        System.out.println(cc);//[(1000,200)]
        System.out.println(pp);//(1000,200)

















//    Collection c=new ArrayList();
//    c.add(Math.random()*10);
//    c.add("two");
//    c.add("three");
//    c.add("four");
//    c.add("five");
//        System.out.println(c);
//        System.out.println("size:"+c.size());
















    }
}
























